The BMW X3 (F25) 35i xDrive Steptronic, produced from 2010 to 2014, represents a significant iteration of BMW’s compact luxury SUV. Positioned as a mid-to-upper trim level within the F25 X3 range, it offered a compelling blend of performance, practicality, and technology. This variant aimed at buyers seeking a more spirited driving experience than the entry-level 28i models, without the higher price tag and more focused sporting character of the xDrive35d diesel. The F25 generation marked a substantial departure from its predecessor, growing in size and adopting a more modern, refined aesthetic and interior.
Technical Specifications
| Brand | BMW |
| Model | X3 |
| Generation | X3 (F25) |
| Type (Engine) | 35i (306 Hp) xDrive Steptronic |
| Start of production | 2010 |
| End of production | 2014 |
| Powertrain Architecture | Internal Combustion engine |
| Body type | SUV |
| Seats | 5 |
| Doors | 5 |
| Fuel consumption (urban) | 11.2 l/100 km (21 US mpg, 25.2 UK mpg, 8.9 km/l) |
| Fuel consumption (extra urban) | 7.4 l/100 km (31.8 US mpg, 38.2 UK mpg, 13.5 km/l) |
| Fuel consumption (combined) | 8.8 l/100 km (26.7 US mpg, 32.1 UK mpg, 11.4 km/l) |
| CO2 emissions | 204 g/km |
| Fuel Type | Petrol (Gasoline) |
| Acceleration 0 – 100 km/h | 5.7 sec |
| Acceleration 0 – 62 mph | 5.7 sec |
| Acceleration 0 – 60 mph | 5.4 sec |
| Maximum speed | 245 km/h (152.24 mph) |
| Emission standard | Euro 5 |
| Weight-to-power ratio | 5.9 kg/Hp, 169.5 Hp/tonne |
| Weight-to-torque ratio | 4.5 kg/Nm, 221.6 Nm/tonne |
| Power | 306 Hp @ 5800 rpm |
| Power per litre | 102.7 Hp/l |
| Torque | 400 Nm @ 1200-5000 rpm (295.02 lb.-ft. @ 1200-5000 rpm) |
| Engine layout | Front, Longitudinal |
| Engine Model/Code | N55B30A |
| Engine displacement | 2979 cm3 (181.79 cu. in.) |
| Number of cylinders | 6 |
| Engine configuration | Inline |
| Cylinder Bore | 84 mm (3.31 in.) |
| Piston Stroke | 89.6 mm (3.53 in.) |
| Compression ratio | 10.2:1 |
| Number of valves per cylinder | 4 |
| Fuel injection system | Direct injection |
| Engine aspiration | Twin-power turbo, Intercooler |
| Engine oil capacity | 6.5 l (6.87 US qt | 5.72 UK qt) |
| Coolant | 9.6 l (10.14 US qt | 8.45 UK qt) |
| Kerb Weight | 1805 kg (3979.34 lbs.) |
| Max. weight | 2365 kg (5213.93 lbs.) |
| Max load | 560 kg (1234.59 lbs.) |
| Trunk (boot) space – minimum | 550 l (19.42 cu. ft.) |
| Trunk (boot) space – maximum | 1600 l (56.5 cu. ft.) |
| Fuel tank capacity | 67 l (17.7 US gal | 14.74 UK gal) |
| Max. roof load | 100 kg (220.46 lbs.) |
| Permitted trailer load with brakes (12%) | 2400 kg (5291.09 lbs.) |
| Permitted trailer load without brakes | 750 kg (1653.47 lbs.) |
| Permitted towbar download | 100 kg (220.46 lbs.) |
| Length | 4648 mm (182.99 in.) |
| Width | 1881 mm (74.06 in.) |
| Width including mirrors | 2098 mm (82.6 in.) |
| Height | 1661 mm (65.39 in.) |
| Wheelbase | 2810 mm (110.63 in.) |
| Front track | 1594 mm (62.76 in.) |
| Rear (Back) track | 1610 mm (63.39 in.) |
| Front overhang | 861 mm (33.9 in.) |
| Rear overhang | 977 mm (38.46 in.) |
| Ride height (ground clearance) | 212 mm (8.35 in.) |
| Drag coefficient (Cd) | 0.35 |
| Minimum turning circle (turning diameter) | 11.9 m (39.04 ft.) |
| Approach angle | 25.7° |
| Departure angle | 22.6° |
| Ramp-over (brakeover) angle | 19.4° |
| Wading depth | 500 mm (19.69 in.) |
| Drive wheel | All wheel drive (4×4) |
| Number of gears and type of gearbox | 8 gears, automatic transmission Steptronic |
| Rear suspension | Independent multi-link suspension |
| Front brakes | Ventilated discs |
| Rear brakes | Ventilated discs |
| Assisting systems | ABS (Anti-lock braking system) |
| Steering type | Steering rack and pinion |
| Power steering | Electric Steering |
| Tires size | 245/50 R18 W |
| Wheel rims size | 8J x 18 |
Powertrain & Engine Architecture
The heart of the X3 35i is BMW’s N55B30A, a 3.0-liter inline-six cylinder engine. This engine is a direct descendant of the N54, but replaces the N54’s complex piezo fuel injectors with more conventional solenoid injectors, improving reliability. The N55 utilizes direct injection, a twin-scroll turbocharger, and Double-VANOS variable valve timing for both intake and exhaust camshafts. This combination delivers a broad torque curve and responsive power delivery. The engine produces 306 horsepower at 5800 rpm and 400 Nm (295 lb-ft) of torque between 1200 and 5000 rpm. The engine is longitudinally mounted, powering all four wheels through BMW’s xDrive all-wheel-drive system. Paired with the N55 is the ZF 8HP80 eight-speed automatic transmission, marketed by BMW as “Steptronic.” This transmission is known for its smooth shifts, quick response, and efficiency. It features a torque converter lock-up clutch for improved fuel economy at cruising speeds.
Driving Characteristics
The X3 35i xDrive Steptronic offers a noticeably more engaging driving experience than the base 28i model. The higher output engine and the eight-speed automatic provide brisk acceleration, with a 0-60 mph time of around 5.4 seconds. The Steptronic transmission is well-programmed, offering both automatic and manual shift modes. In automatic mode, it generally selects the appropriate gear for the driving situation, while manual mode allows the driver to take full control. The xDrive all-wheel-drive system provides excellent traction in all weather conditions. The suspension is tuned for a balance between comfort and handling, providing a relatively smooth ride without sacrificing too much agility. Compared to the 28i, the 35i feels more confident and composed when pushed harder through corners.
Equipment & Trim Levels
The X3 35i xDrive Steptronic typically came well-equipped as standard. Common features included leatherette upholstery, power-adjustable front seats, a premium sound system, automatic climate control, and BMW’s iDrive infotainment system with a 6.5-inch display screen. Optional extras were plentiful, including a panoramic sunroof, navigation system, heated front seats, upgraded leather upholstery, and a suite of driver assistance features such as lane departure warning and blind spot monitoring. Trim levels varied slightly depending on the market, but generally offered packages that bundled together popular options.
Chassis & Braking
The F25 X3 utilizes a MacPherson strut front suspension and a multi-link rear suspension. The 35i model typically featured slightly stiffer springs and dampers compared to the 28i, contributing to its more sporty handling. Braking duties are handled by ventilated disc brakes on all four wheels. The braking system is assisted by ABS, electronic brakeforce distribution, and brake assist. The X3 35i’s curb weight of around 1805 kg (3979 lbs) necessitates a robust braking system to provide confident stopping power.
Market Reception & Comparison
The X3 35i was generally well-received by automotive critics. It was praised for its powerful engine, refined interior, and comfortable ride. However, some critics noted that the X3’s handling wasn’t as sharp as some of its competitors, such as the Porsche Macan. Compared to the X3 28i, the 35i offered a significant performance upgrade, but at a higher price point. The X3 35d, with its diesel engine, offered even more torque and slightly better fuel economy, but was also more expensive. The 35i struck a good balance between performance, efficiency, and price, making it a popular choice for buyers in this segment.
Legacy
The N55 engine, found in the X3 35i, has proven to be a relatively reliable powerplant, although it is not without its potential issues. Common concerns include oil leaks, fuel injector failures, and occasional cooling system problems. However, with proper maintenance, these engines can provide many years of reliable service. The F25 X3 35i remains a desirable used car today, offering a compelling combination of luxury, performance, and practicality. Its robust build quality and well-engineered powertrain contribute to its continued appeal in the used car market.
